Wow, can't say I have ever seen any mods. This would be interesting though. The only question I have is, how are you going to keep the ball from damaging the screen when its closed. I mean, the ball will stick up above the keypad/trackpad area...

Also, I am not too certain how easy this would be, a trackball takes up quite a bit of room and a trackpad is very minimal.

I like trackballs much more than trackpads, but you'd be better off making a tiny external USB one and just setting it on top of your trackpad during use. It's too bad the PowerBooks don't have a type III PCMCIA slot, as one would probably fit in there easily enough for storage…

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